The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 1995
Filed:
May. 24, 1994
Tetsuya Iga, Itami, JP;
Naoyuki Kato, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed a PLL circuit wherein a delay circuit (3') of a phase comparator (30') receives a supply current (IC) from a first variable current source (.PHI.IC) and changes a delay time (.DELTA.T) in negative correlation with the amount of the supply current (IC), and the first variable current source (.PHI.IC) changes the amount of the supply current (IC) to the delay circuit (3') in accordance with the indication of a control signal (C1) serving as a supply current control signal for a second variable current source (.PHI.IA) and a third variable current source (.PHI.IB) of a charge pump circuit (31). Changes in delay time of the delay device of the phase comparing device are adapted such that the delay time is constantly suitable as the amount of current of the phase comparison voltage signal of the charge pump circuit changes, permitting reduction in lock-up time.